| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester film for processing which even when subjected to processing including a process of heating the film, does not wrinkle nor sag and has excellent flatness after processed. SOLUTION: The biaxially oriented polyester film for processing is characterized in that difference between a heat shrinkage ratio at 180°C for 5 minutes in a MD direction and that in a TD direction is <2.1%. Preferably difference between the heat shrinkage ratio at 120°C for 5 minutes in the MD direction and that in the TD direction is <0.6% and more preferably difference between the heat shrinkage ratio at 150°C for 5 minutes in the MD direction and that in the TD direction is <2.1%. COPYRIGHT: (C)2009,JPO&INPIT |
